Pyrotechnic display



June 25, 1935. R. c. HlTT IYROTECHNIC DISPLAY Filed Oct. 13, 1951 rammed June '25, 1935 r rm rmnmcnlsrtar;

' nay 0.11m, Seattle, Wash. Application October 13, 1931, Serial No. 568,595 2.01aims. (o1. 102 20) This invention relates to pyrotechnic displays; and more particularly, to what is commonly known as Sparklers.

The principal object of this invention is to provide a casing in the form of a tube of combustible materialfilled with fireworks composition, and

sealed at both ends. The outer casing is of slower burning texture than the fireworks composition so that although the outer casingis consumed during the burning operation, thereis always a slight shell extending above the burning compositionso as to form a chamber in which gases will form. This results in the fiame being forced out .in the form of a spray ascontrasted with the illumination known as Lights.

I-Ieretofore Sparklers have been formed by placing the .fireworks material on a wire. This is highly objectionablein that even though the sparks coming from the of the Wire itself. v v

Lights of the fusee type contain an outer casing and are filled with a fireworks composition, butinstead of obtainingthe chimneying effect as produced in my invention, only a soft light results. Thisis primarily due, I believe, to the fact that the outer casing burns at the same rate as the fireworks composition.

Another object is to provide a display that is safe to handle and that is devoid of the objectionable features now found in such devices.

Other objects will be disclosed in the specification and claims forming a part of this application. 1

In thedrawingz,

Figure 1 is a side elevation of the display;

Figure 2 is a side. elevation withparts broken away;

Figure 3 is a vertical fragmentary sectionshow ing the display ignited and the'action' of the fireworks composition; V I V Figure 4 is a top plan of the display; and

Figure 5 is a horizontal section taken'on the line 5-5 of Figure 3. 1 e a Referring to the drawing, in which similar parts aredesignated with like numerals:

Numeral 6 designates a display of the Spark-.

ler type havinga casing 1 formed" of thin paper in the form ofa spiral. It is to be understood that this casingis formed in this waymerely for convenience, and my inven, on is in no way limited to this construction.- In order to retard the free burning of the functioning of the device. a wall 1/64th of an inch in diameter with an Light composition produced by what are commonly Sparkler are harm: less, the residue left on the wire is very hot and often results in serious burns. This is also true casing, 1, I coat the same with paraffin 8, which coating may be any other substance of similar characteristics.

It has been found that the amount of paraffin used enters into the successful manufacture and In a display having interior diameter of composition of 9/64th of an inch, there should be sufficient paraifin so that when the same is melted by the burning of the composition it will penetrate the composition to the depth of about of an inch before the fire reachesthe same. Ordinary Sparkler or 9, such asbarium nitrate, 16 parts, chlorate of potash, 14 parts, red gum, 4 parts, aluminum, 8 parts is used which will givea green display; and a red display may be obtained by using the following ingredientsstrontium nitrate, 16 parts, chlorate of potash, 10 parts, red gum, 5 parts, and aluminum, 1 parts. This composition is used in the casing Land both ends l0 and II of the casing are sealed with the retarding medium'parafiin so as to prevent the escape of the fireworks composition also to protect the same from moisture.

As actually used, either end of the display 6 may be ignited, the paraffin melting until the fireworks composition 9 is-exposed so that in conjunction with the inflammable casing 1, the display starts functioning. 7

As shown in Figure 4, thefireworks material burns slightly .faster than the outside casing, which results in gases set up by the. burning fireworks composition being compressed and in turn forcing the flames out of the end of the casing in the form of a fountain of spray. The paraifin will melt flowing into'the fireworks composition and giving added effects.

By the use of thin paper and coating the same with paraifin, the same efiect is obtained as, if

and

l a thicker, slower burning casing were used, with What I claim as my invention is:

1. A pyrotechnic display comprising a thin casing treated with a slow burning material, a fireworks composition containing spark producing metallic particles in said casing, said casing and fireworks composition adapted to be ignited at one end of said casing, the casing being of slower burning material than said composition, a chimney formed by said slow burning casing, said chimney confining for ashort duration gases formed from the burning composition, said gases forcing the flames from the burning composition outoi said casing to give a sparkler combustible casing treated with a slow burning material, a fireworks composition containing spark producing metallic particles in said casing, said casing and'fireworks composition adapted to be ignited at one end of said casing, the casing being of slower burning material than said composition, a chimney formed by said slow-burning casing, said chimney confining for a short duration gases formed from the burning composition, said casing being completely consumed and leaving no scoria, said gases-forcing the flames from the burning composition out of said casing to give a sparkler efiect.

RAY C. HITT.

2. A pyrotechnic display comprising a thin 

